apache前端+nginx后端，nginx如何rewrite正确的地址

运行环境
centos 6.5 + lanmp
apache作后端，nginx作前端
软件: wordpress

nginx虚拟主机配置如下：
server {
listen 80;
server_name xxx.com;
root /var/www/xxx/html;
index index.html index.htm index.php;

#这句是wordpress的rewriter语句
location / {
    try_files $uri $uri/ /index.php?q=$uri&$args;
}

#php文件转发给apache处理
location ~ \.(php)?$ {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://127.0.0.1:8080;
}

}

如果是在lnmp环境下，下面的rewrite语句是没问题的
location / {
try_files $uri $uri/ /index.php?q=$uri&$args;
}

但在lanmp环境下，点击地址后，地址栏的地址是变了，显示的页面却是首页。不知道是哪里错了？

固定链接样式：http://xxx.com/xxx/

---

location / {
    try_files $uri @apache ;
}

location @apache {
    internal;
    proxy_pass http://127.0.0.1:8080;
}